Cannot add Category

Description

Using PHP Version 4.4.2, with MySQL 4.1.22 after a fresh install. Login with the given administrator password and go to "Posts" -> "Categories". Enter a new category name, and category slug. Then click on "Add". Nothing happens.

Because it's a webhost i don't have access to the PHP logs, and ini_set() doesn't do anything. Neither does an .htaccess with display_errors/display_startup_errors.

I can reproduce this everytime with the above configuration with ff3.5.3 on Linux and Macintosh. It works fine with Safari.